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// Other services

Port 3429: GCSP user port

Port 3429 is assigned by IANA to gcsp (GCSP user port).

3429

How gcsp works

Other services
client:3429gcspresponse client:3429gcspresponse

The client sends a request to port 3429 and the gcsp service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 3429 dangerous?

We have no specific security note for port 3429. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 3429

ServicePortTransportDescriptionReferenceUpdated
gcsp 3429 TCP, UDP GCSP user port - 2002-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 3429, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3429'      # process listening on 3429
sudo lsof -nP -i :3429

macOS

sudo lsof -nP -i :3429

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3429 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3429
netstat -ano | findstr :3429

From another machine

nmap -p 3429 -sV <host>
sudo nmap -sU -p 3429 <host>
nc -zv <host> 3429

Block it in the firewall

sudo ufw deny 3429/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3429" -Direction Inbound -LocalPort 3429 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3429 used for?

Port 3429 is assigned by IANA to gcsp (GCSP user port).

Is port 3429 TCP or UDP?

Port 3429 is registered for TCP and UDP.

Is it safe to open port 3429?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 3429 is open?

On Linux run "ss -ltnup 'sport = :3429'", on macOS "lsof -nP -i :3429", and on Windows "netstat -ano | findstr :3429" to see the local process. From another machine, "nmap -p 3429 <host>" shows whether it is reachable.

05 Related
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